#app{
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background-color: #2b88f0;
  min-height: 100vh;
}

.content{
  display: flex;
  align-items: flex-end;
}

textarea{
  resize: none;
  width: 500px;
  min-height: 200px;
  border-radius: 20px;
  padding: 20px;
  color: #333;
  font-size: 20px;
  box-shadow: 0 0 5px #ccc;
  border: 2px solid transparent;
}
textarea::-webkit-scrollbar {
  display: none;
}


#start_btn{
  width: 100px;
  height: 40px;
  border-radius: 10px;
  background-color: #1aa034;
  color: #fff;
  font-size: 16px;
  margin-left: 20px;
}
#start_btn.disabled{
  background-color: #ccc;
}

#start_btn:active{
  transform: scale(.98);
}

#start_btn.disabled:active{
  transform: scale(1);
}


textarea:focus{
  border-color: #273c75;
}

.tips{
  color: #fff;
  font-size: 24px;
  /* font-weight: 700; */
  margin-bottom: 20px;
}

.list{
  display: flex;
  flex-wrap: wrap;
  margin-top: 15px;
  width: 500px;
}
.item{
  padding: 0 20px;
  background-color: #fcc31e;
  margin-right: 10px;
  margin-bottom: 10px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  border-radius: 15px;
  color: #fff;
  font-size: 16px;
  transition:background .25s ease-out ;
}
.item.active{
  background-color: #273c75;
}
